System.data.dataset Problem

Question

Hi All : I am writing the following to use Powershell to get SQL server information:
Add-Type -Path 'C:\Windows\assembly\GAC_MSIL\Microsoft.SqlServer.Smo\11.0.0.0__89845dcd8080cc91\Microsoft.SqlServer.Smo.dll'
$finalDataSet = New-Object System.Data.Dataset
get-content 'C:\Serverlist.txt' | where { ($_ -eq "server2") -or ($_ -eq "server1")  } | foreach-object {
$SQLServer=$_
$SQLDBName = "master"
$SqlQuery = "select * from master.sys.databases"
$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
$SqlConnection.ConnectionString = "Server = $SQLServer; Database = $SQLDBName; Integrated Security = True"
$SqlCmd = New-Object System.Data.SqlClient.SqlCommand
$SqlCmd.CommandText = $SqlQuery
$SqlCmd.Connection = $SqlConnection
$SqlAdapter = New-Object System.Data.SqlClient.SqlDataAdapter
$SqlAdapter.SelectCommand = $SqlCmd
$DataSet = New-Object System.Data.DataSet
$SqlAdapter.Fill($DataSet)
$SqlConnection.Close()
clear
$DataSet.Tables[0] | select name
$finaldataset.Tables.add($dataset.tables[0])
$finaldataset | select name
but get the following error:
Exception calling "Add" with "1" argument(s): "DataTable already belongs to another DataSet."
At line:24 char:25
+ $finaldataset.Tables.add <<<< ($dataset.tables[0])
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException
Any problem in the script??

Answer 1

Hi Sakurai,
Apparently you can't just copy a DataTable object from one DataSet object to another DataSet object using the Add method or assign a DataTable object to multiple DataSet objects.
However you can try the following: Instead of creating an inner DataSet object you create a DataTable object:
$DataTable = New-Object System.Data.DataTable
$SqlAdapter.Fill($DataTable)
After that you assign your DataTable object to the outer DataSet object:
$DataTable | select name
$finaldataset.Tables.add($DataTable)
Good luck.
Best regards,
Arjen